Printable Hard Sudoku

Set et2dih. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
4 7 1
5 1
7 2 6
4 2
5 8 2 3 1 7
7 9
3 1 2
5 6 3 4
8 4 5 7
Hard #2
1 6 2 5
4 6 1 7
5 2 3
9 8 1
4 5 9 2
6 4
1 9 8
8 3 5
4 7 3
Hard #3
2 1
5 2 6
9 8 6 7 4
4 7 9 3
2 4 5
1 8 7 2
5 1 7
6 4 9 8 2
Hard #4
5 4 7
6 8
7 4 6 9
4 3
7 3 8
2 6 5 3
1 2 6 7
5 7 8
3 5 8 1
Hard #5
3 6 9 7 4
3 5 1
4 6 9 5
9 4 1
1 6 7 2
8 4
5 2 6
3
9 4 5 8
Hard #6
4 3 1
1 3
5 7 3 8 2
2 5 9
5 6 7
7 3 9 8 5
8 5 7 1 9
6
9 7
Hard #7
4 2 5
8 5 6 2
1 7
7 1 6 8 5 4
9 4 1
3 7 9
7 4
6 1 2
7 9 4
Hard #8
6 5 7 2 4
5
7 4 9 8
2 8 9
8 9 7 3
7 1 2
5 8 4
6 5 3
2 9 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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